KENNETH W. FINK / SCIENCE PHOTO LIBRARY KENNETH W. FINK / SCIENCE PHOTO LIBRARY
Stegosaurus dinosaur model. Stegosaurus was a slow, lumbering dinosaur that measured up to nine metres long. Its feeble jaws and teeth indicate it was a herbivore. The distinctive spines running in two rows along its back are thought to have helped control body temperature by radiating or absorbing heat. Not the most quick-witted of dinosaurs, Stegosaurus had a brain the size of a walnut - a fact that may explain why dinosaurs are often thought of as moronically stupid.
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